How much space...

I've read so many different answers for this. How much space does each chicken need in their coop and run? I've heard from 2 square feet per bird up to 10 square feet. Which one is right? I'm only getting 3 chickens, so how big should the coop and run be??
Thanks.

Yes, the usual recommendation is 4 square feet per bird of indoor coop space, with 12 square feet per bird of space in the run. If it's a chicken tractor, though, some people say you don't need as much space in the run, since the run stays fresh because it's moved so often.

the book says 4sqft in henhouse.an 10sqft in the run pre bird.but i dont go by the book.in my henhouse im running 7ft pre bird.but im under stocked.i like to run 2 or 3ft pre bird in henhouse.the reason for that is they out in the run all day long.

Yes. I always wonder this too. There is coop space, roost space and run space.

My coop is 24 square feet. My 2 roosts run 68 inches long right in the middle of this 24 square feet of coop space. Is this okay?

I have five standards and two banties. 24 divided by 6 is 4 square feet. I used six, since the banties count as one Standard. 4 square feet.

Yet, two 68 inches long roosts are right down the middle. Each roosts gives them 11.3 inches of space. Maybe I should take the other roost out and give them more floor space. I would think that they would all want to roost together at night. I was also told that they don't hang out in the coop during the day.

Part of my run is below the coop, which would be 24 square feet, It is 3/4 protected from wind and predators. The rest is open for them to access the outdoors, with an additional 24 square feet run space. This would give me 8 square feet per bird. The coop moves on wheels, so therefore does that help with them not having 10 square feet? Also I plan on letting them free range as often as I can.

The roost and floor space is what is confusing. Any pros out there to comment?